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Portable navigation system and device with audible turn instructions |
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Device and method for calibrating and improving the accuracy of barometric altimeters with GPS-derived altitudes |
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Portable navigation system and device with audible turn instructions |
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Method and apparatus for calculating altitude based on barometric and GPS measurements |
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Device and method for calibrating and improving the accuracy of barometric altimeters with GPS-derived altitudes |
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Method of digitizing emboss dies and the like |
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GPS device with compass and altimeter and method for displaying navigation information |
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GPS device with compass and altimeter and method for displaying navigation information |
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